Traits name details
original description
(of Protounio cardiiformis Martinson, 1953 †) Martinson, G.G. (1953). Novyye unionidy iz verkhnemelovykh otlozheniy Mongolii [New unionids from Upper Cretaceous deposits of Mongolia]. <em>Doklady Akademii Nauk SSSR.</em> 89(1): 167-170. page(s): 168, figs 1, 2 [details] Available for editors 
basis of record
Sha, J. (2007). Cretaceous trigonioidid (non-marine Bivalvia) assemblages and biostratigraphy in Asia with special remarks on the classification of Trigonioidacea. <em>Journal of Asian Earth Sciences.</em> 29(1): 62-83., available online at https://doi.org/10.1016/j.jseaes.2006.01.003 page(s): 75 [details] Available for editors 
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